| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve rolling fatigue life by inhibiting production of incompletely quenched structures in a member composing a roller bearing. <P>SOLUTION: An inner ring, an outer ring or a roller is obtained by processing a material into a prescribed shape and subsequently quenching and tempering the same, wherein the material is made of an alloy steel which comprises, by mass, 0.90-1.2% C, 0.20-0.70% Si, 0.30-1.20% Mn, 0.90-1.6% Cr, ≤0.30% Mo and the balance being Fe and unavoidable impurities and has a DI value of 5.0-9.0, which is defined by the equation (1): (1) DI=(0.18[C]+0.16)(0.7[Si]+1.0)(3.4[Mn]+1.0)(2.2[Cr]+1.0)(3.0[Mo]+1.0). <P>COPYRIGHT: (C)2010,JPO&INPIT |
